Constant distortion volume control unit



FIG. 1 is a front perspective view of a constant distortion volume control unit, showing my new design;

FIG. 2 is a front elevation of the unit;

FIG. 3 is a left side elevation of the unit as seen from the left of FIG. 2;

FIG. 4 is a rear elevation of the unit;

FIG. 5 is a top plan view of the unit; and

FIG. 6 is a bottom plan view of the unit. 

The ornamental design for a constant distortion volume control unit, as shown and described. 